Unit Name: Triune Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Undefined
Usage: Currently in use
Age Interval: Cambrian - Devonian (542 - 359.2 ma)
Province/Territory: British Columbia

Originator: Fyles and Eastwood, 1962

The Triune Formation varies greatly in thickness . It reaches approximately 305 metres on the northwest side of Gainer Creek and thins rapidly to the southeast pinching out in the cliffs north of Redcliff Peak.

Locality Data:
Thickness(m): Minimum 0, Maximum 305.

The Triune Formation consists of laminated to medium-bedded, grey to black phyllite, slate and argillite.

The Triune Formation belongs to the Lardeau Group. The formation is gradational with the overlying Ajax Formation and is conformable with the underlying Index Formation.

Fyles, James T. and Eastwood, G.E.P., 1962. Geology of the Ferguson area, Lardeau District, British Columbia; British Columbia Department of Mines and Petroleum Resources, Bulletin No. 45, 92 p. + XIV plates.

Contributor: Holly Girling
Entry Reviewed: No
Name Set: Lithostratigraphic Lexicon
LastChange: 05 Mar 2009